Frontal sinus
Airspace below ridge of eyebrow in humam anatomy
The frontal sinuses are one of the four pairs of paranasal sinuses that are situated behind the brow ridges. Sinuses are mucosa-lined airspaces within the bones of the face and skull. Each opens into the anterior part of the corresponding middle nasal meatus of the nose through the frontonasal duct which traverses the anterior part of the labyrinth of the ethmoid. These structures then open into the semilunar hiatus in the middle meatus.
Structure
[edit]Each frontal sinus is situated between the external and internal plates of the frontal bone.[1][2] Their average measurements are as follows: height 28&#;mm, breadth 24&#;mm, depth 20&#;mm, creating a space of ml.[3]
Each frontal sinus extends into the squamous part of the frontal bone superiorly, and into the orbital part of frontal bone posteriorly to come to occupy the medial part of the roof of the orbit.[2]
Each sinus drains through an opening in its inferomedial part into the frontonasal duct.[2]
Vasculature
[edit]The mucous membrane of[citation needed] the frontal sinus rece
Frontal sinus
Frontal sinus Definition
It refers to one of the two air-filled cavities in the frontal bone. In Latin, it is also referred to as “Sinus Frontales”.
Frontal sinus Location
The frontal sinuses are located within the lamina of the frontal bone. These can be found behind the superciliary arches, between the bones of the skull and face.
Picture 1 &#; Frontal sinus
Frontal Sinus Description
Frontal Sinuses are membranous and are lined by mucosa. Their shape and size vary among individuals. Usually, these are absent at the time of birth. However, they are often found to be quite well developed by the time an individual reaches his or her seventh and eighth years. The sinuses attain full size after puberty. The bone tissue begins to ossify only at about two years of age. Until then, a recess can rarely be detected. Naturally, this structure is not apparent on radiograph images before that time.
These sinuses are mostly asymmetrical. The septum present between them often diverts to either side of the middle line. While the development of sinus begins in the womb, only the ethmoid, and maxillary sinuses are found to be present at birth. Around 5% of
Frontal sinus
The frontal sinus (Latin: sinus frontalis) is a paired air-filled and triangular-shaped cavity located within the frontal bone of the skull. It is the most superior located sinus of all paranasal sinuses.
The frontal sinuses are situated posterior to the superciliary arches of the frontal bone above the glabella. In the posterior direction, they can extend to the lesser wings of the sphenoid bone. Eachfrontal sinus opens into the middle nasal meatus via the nasofrontal duct.
Blood supply of frontal sinus
The arterial blood vessels supplying the frontal sinus include the supraorbital and anterior ethmoidal arteries. Both arteries are branches of the ophthalmic artery. The venous blood is collected from the sinus by the same-named veins accompanying the arteries. Both veins drain into the superior ophthalmic vein.
Nerve supply of frontal sinus
The sensory innervation of the mucosa is provided by branches of the supraorbital nerve - a terminal branch of the frontal nerve arising from the ophthalmic division (CN V1) of the trigeminal nerve (CN V). Besides the supraorbital nerve, the frontal sinus is also suppl
The frontal sinuses are the paranasal sinuses within the frontal bone. They are lined with mucosa and are most often two in number.
On this page:
The frontal sinus has two chambers, one on each side, and they are almost always asymmetrical and separated by a septum. Each sinus extends superior to the medial end of the eyebrow and back into the orbital portion of the frontal bone. However, three or more chambers may be present in ~10% (range %%). It is divided by thin bony intrasinus septa, usually off-midline and rarely dehiscent.
The orbit and anterior cranial fossa form important relations to these sinuses.
Drainage from the frontal sinus tends to be more variable than the other paranasal sinuses and there is inconsistent terminology used in its anatomic description 3. In general, the frontal sinus outflow tract consists of a narrowing at the lower medial corner of the sinus (frontal infundibulum), where an ostium (opening) is demarcated by a small ridge of bone at the anterior sinus wall. Inferior to the ostium, drainage continues along a narrow passage known as the frontal recess4 or superior compartment of the frontal sinus drainage pathway 3. At this point,
Frontal sinus
The frontal sinus (Latin: sinus frontalis) is a paired air-filled and triangular-shaped cavity located within the frontal bone of the skull. It is the most superior located sinus of all paranasal sinuses.
The frontal sinuses are situated posterior to the superciliary arches of the frontal bone above the glabella. In the posterior direction, they can extend to the lesser wings of the sphenoid bone. Eachfrontal sinus opens into the middle nasal meatus via the nasofrontal duct.
Blood supply of frontal sinus
The arterial blood vessels supplying the frontal sinus include the supraorbital and anterior ethmoidal arteries. Both arteries are branches of the ophthalmic artery. The venous blood is collected from the sinus by the same-named veins accompanying the arteries. Both veins drain into the superior ophthalmic vein.
Nerve supply of frontal sinus
The sensory innervation of the mucosa is provided by branches of the supraorbital nerve - a terminal branch of the frontal nerve arising from the ophthalmic division (CN V1) of the trigeminal nerve (CN V). Besides the supraorbital nerve, the frontal sinus is also supplied by the orbi